WO2023153835A1 - Procédé et appareil de commande d'une station de base dans un système de communication sans fil - Google Patents

Procédé et appareil de commande d'une station de base dans un système de communication sans fil Download PDF

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Publication number
WO2023153835A1
WO2023153835A1 PCT/KR2023/001920 KR2023001920W WO2023153835A1 WO 2023153835 A1 WO2023153835 A1 WO 2023153835A1 KR 2023001920 W KR2023001920 W KR 2023001920W WO 2023153835 A1 WO2023153835 A1 WO 2023153835A1
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WIPO (PCT)
Prior art keywords
terminal
trp
signal
random access
base station
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PCT/KR2023/001920
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English (en)
Korean (ko)
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김영범
김윤선
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삼성전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present disclosure relates generally to wireless communication systems, and more particularly to methods and apparatus for control of base stations in wireless communication systems.
  • 5G mobile communication technology defines a wide frequency band to enable fast transmission speed and new services. It can also be implemented in the ultra-high frequency band ('Above 6GHz') called Wave.
  • 6G mobile communication technology which is called a system after 5G communication (Beyond 5G)
  • Beyond 5G in order to achieve transmission speed that is 50 times faster than 5G mobile communication technology and ultra-low latency reduced to 1/10, tera Implementations in Terahertz bands (eg, such as the 3 Terahertz (3 THz) band at 95 GHz) are being considered.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communications
  • mMTC massive machine-type communications
  • Beamforming and Massive MIMO to mitigate the path loss of radio waves in the ultra-high frequency band and increase the propagation distance of radio waves, with the goal of satisfying service support and performance requirements, and efficient use of ultra-high frequency resources
  • numerology support multiple subcarrier interval operation, etc.
  • BWP Band-Width Part
  • large capacity New channel coding methods such as LDPC (Low Density Parity Check) code for data transmission and Polar Code for reliable transmission of control information, L2 pre-processing, and dedicated services specialized for specific services Standardization of network slicing that provides a network has been progressed.
  • LDPC Low Density Parity Check
  • NR-U New Radio Unlicensed
  • UE Power Saving NR terminal low power consumption technology
  • NTN non-terrestrial network
  • IAB Intelligent Internet of Things
  • IIoT Intelligent Internet of Things
  • DAPS Dual Active Protocol Stack
  • 2-step random access that simplifies the random access procedure
  • RACH for Standardization in the field of air interface architecture/protocol for technologies such as NR
  • an architecture eg, service based architecture, service based interface
  • MEC mobile edge computing
  • AR augmented reality
  • VR virtual reality
  • MR mixed reality
  • XR extended reality
  • AI artificial intelligence
  • ML machine learning
  • FD-MIMO Full Dimensional MIMO
  • Array Antenna for guaranteeing coverage in the terahertz band of 6G mobile communication technology.
  • multi-antenna transmission technologies such as large scale antennas, metamaterial-based lenses and antennas to improve coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), RIS ( Reconfigurable Intelligent Surface) technology, as well as full duplex technology to improve frequency efficiency and system network of 6G mobile communication technology, satellite, and AI (Artificial Intelligence) are utilized from the design stage and end-to-end (End-to-End) -to-End) Development of AI-based communication technology that realizes system optimization by internalizing AI-supported functions and next-generation distributed computing technology that realizes complex services beyond the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources could be the basis for
  • the present disclosure provides a method and apparatus for controlling a base station in a wireless communication system.
  • a first transmission reception point includes at least one transceiver; and a controller coupled to the at least one transceiver, wherein the controller provides a first signal including information about one or more TRPs operating in a frequency band different from the first TRP to the terminal. transmits, and receives a random access preamble including information on at least one TRP preferred by the terminal determined based on the first signal from the terminal, and the first TRP is When the second TRP is determined based on the information, transmitting a signal instructing the second TRP to switch to a switch-on state, and instructing the terminal to perform a random access procedure with the second TRP It can be configured to transmit a signal.
  • a second transmission reception point may include at least one transceiver; and a controller coupled to the at least one transceiver, wherein the controller receives a signal instructing to change a switch state of the second TRP, and based on the received signal, The switch state is switched, and when the switched switch state is a state in which the transmission and reception functions of the second TRP are activated, a first signal is transmitted to the terminal, and from the terminal, based on the first signal to receive a random access preamble.
  • Apparatus and method according to various embodiments of the present disclosure may provide a method and apparatus for controlling a base station in a wireless communication system.
  • FIG. 1 shows an example of a basic structure of a time-frequency resource domain in a 5G system.
  • FIG. 2 shows an example of a time-domain mapping structure of a synchronization signal and a beam sweeping operation.
  • FIG. 4 illustrates an example of a procedure for a UE to report UE capability information to a base station.
  • FIG. 6 shows an example of a communication system composed of an access carrier and a data carrier.
  • FIG. 7 shows an example of an operating scenario of a communication system composed of an access carrier and a data carrier.
  • FIG. 8 shows an example of an operating scenario of a communication system composed of an access carrier and a data carrier.
  • FIG 9 shows an example of an operating scenario of a communication system composed of an access carrier and a data carrier.
  • FIG. 10 illustrates an example of a random access procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 11 illustrates an example of a random access procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 12 illustrates an example of a random access procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 13 shows an example of an interconnection relationship between a random access preamble and a data carrier.
  • FIG. 14 shows an example of an interconnection relationship between a random access preamble and a data carrier.
  • 15 shows an example of an interconnection relationship between a random access preamble and a data carrier.
  • FIG. 16 illustrates an example of a terminal procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 17 illustrates an example of an access carrier procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 18 illustrates an example of a data carrier procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 19 illustrates an example of a data carrier procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 20 illustrates a terminal transceiver in a wireless communication system according to various embodiments of the present disclosure.
  • 21 illustrates an example of a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 22 illustrates an example of a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
  • each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions.
  • These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions.
  • These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory
  • the instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s).
  • the computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is possible for the functions mentioned in the blocks to occur out of order. For example, it is possible that two blocks shown in succession may in fact be performed substantially concurrently, or that the blocks may sometimes be performed in reverse order depending on their function.
  • ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' performs certain roles. do.
  • ' ⁇ part' is not limited to software or hardware.
  • ' ⁇ bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, ' ⁇ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components and ' ⁇ units' may be combined into smaller numbers of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
  • components and ' ⁇ units' may be implemented to play one or more CPUs in a device or a secure multimedia card.
  • ' ⁇ unit' may include one or more processors.
  • connection node a term referring to network entities, a term referring to messages, a term referring to an interface between network objects, and various types of identification information. Referring terms and the like are illustrated for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.
  • a physical downlink shared channel is a term that refers to a physical channel through which data is transmitted, but PDSCH may also be used to refer to data. That is, in the present disclosure, the expression 'transmitting a physical channel' may be interpreted as equivalent to the expression 'transmitting data or signals through a physical channel'.
  • higher-order signaling refers to a method of transmitting a signal from a base station to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer.
  • Higher signaling may be understood as radio resource control (RRC) signaling or media access control (MAC) control element (CE).
  • RRC radio resource control
  • MAC media access control
  • the present disclosure uses terms and names defined in the 3GPP NR (New Radio: 5th generation mobile communication standard) standard.
  • the present disclosure is not limited by the above terms and names, and may be equally applied to systems conforming to other standards.
  • the term terminal may indicate other wireless communication devices as well as mobile phones, smart phones, IoT devices, and sensors.
  • a base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B, gNB, eNode B, eNB, Node B, BS (Base Station), a radio access unit, a base station controller, or a node on a network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions.
  • UE user equipment
  • MS mobile station
  • a cellular phone a smart phone
  • computer or a multimedia system capable of performing communication functions.
  • multimedia system capable of performing communication functions.
  • 5G a next-generation communication system after LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution), to handle the recent explosively increasing mobile data traffic (5 th Generation) system or the initial standard of New Radio access technology (NR) has been completed.
  • LTE Long Term Evolution
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • LTE-A LTE-Advanced or E-UTRA Evolution
  • the 5G system provides eMBB (enhanced Mobile BroadBand) service to improve existing voice/data communication, ultra-reliable and low latency (ultra-reliable and low-latency) It aims to satisfy various services and requirements, such as Latency Communication (URLLC) service and massive MTC (Machine Type Communication) service that supports mass machine-to-machine communication.
  • eMBB enhanced Mobile BroadBand
  • URLLC Latency Communication
  • massive MTC Machine Type Communication
  • the 5G system mainly targets ultra-high-speed data service up to several Gbps by utilizing a much wider ultra-wide bandwidth. Accordingly, the 5G system considers an ultra-high frequency band from a few GHz to a maximum of 100 GHz, where it is relatively easy to secure an ultra-wide bandwidth frequency, as a candidate frequency. In addition, it is possible to secure a wide bandwidth frequency for the 5G system through frequency rearrangement or allocation among frequency bands from hundreds of MHz to several GHz used in existing mobile communication systems.
  • Radio waves in the ultra-high frequency band have a wavelength of several millimeters and are also referred to as millimeter waves.
  • the pathloss of radio waves increases in proportion to the frequency band, so the coverage of the mobile communication system becomes small.
  • beamforming technology is applied to increase the reach distance of radio waves by concentrating radiated energy of radio waves to a predetermined destination using a plurality of antennas. That is, the signal to which the beamforming technology is applied has a relatively narrow beam width, and radiant energy is concentrated within the narrowed beam width, so that the radio wave arrival distance increases.
  • the beamforming technology may be applied to a transmitting end and a receiving end, respectively. Beamforming technology has an effect of reducing interference in an area other than a beamforming direction, in addition to an effect of increasing coverage. In order for the beamforming technology to properly operate, an accurate measurement and feedback method of a transmission/reception beam is required.
  • the beamforming technology may be applied to a control channel or a data channel corresponding to a predetermined terminal and a base station on a one-to-one basis.
  • a control channel and a data channel for transmitting a common signal transmitted from a base station to a plurality of terminals in the system for example, a synchronization signal, a physical broadcast channel (PBCH), and system information Beamforming technology can also be applied to increase coverage.
  • PBCH physical broadcast channel
  • system information Beamforming technology can also be applied to increase coverage.
  • a beam sweeping technology that transmits a signal by changing a beam direction is additionally applied so that a common signal can reach a terminal existing at an arbitrary position in a cell. do.
  • an ultra-low latency service with a transmission delay of about 1 ms between transmitting and receiving ends is required.
  • TTI Transmission Time Interval
  • the TTI is a basic time unit for performing scheduling, and the TTI of the existing LTE and LTE-A systems is 1 ms corresponding to the length of one subframe.
  • 0.5ms, 0.25ms, 0.125ms, etc. which are shorter than existing LTE and LTE-A systems, are possible.
  • the present disclosure relates to a method and apparatus for efficient frequency use and reduction of base station energy consumption in a wireless communication system.
  • the present disclosure provides a method and apparatus for reducing energy consumption of a base station and efficiently using a frequency in a mobile communication system.
  • the present invention by defining a signal transmission method between a base station and a terminal in a mobile communication system, it is possible to solve the problem of excessive energy consumption of the base station and achieve high energy efficiency. In addition, the effect of increasing the frequency efficiency of the mobile communication system can be achieved.
  • FIG. 1 shows an example of a basic structure of a time-frequency resource domain in a 5G system.
  • FIG. 1 is a diagram showing the basic structure of a time-frequency resource domain, which is a radio resource domain in which a data or control channel of a 5G system is transmitted.
  • a horizontal axis represents a time domain and a vertical axis represents a frequency domain in FIG. 1 .
  • the minimum transmission unit in the time domain of the 5G system is an orthogonal frequency division multiplexing (OFDM) symbol, (102) symbols are gathered to form one slot (106), The number of slots may form one subframe 105 .
  • the length of the subframe is 1.0ms, and 10 subframes may be gathered to form a 10ms frame 114.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may consist of a total of N BW (104) subcarriers.
  • a basic unit of resources in the time-frequency domain is a resource element (RE) 112, which may be represented by an OFDM symbol index and a subcarrier index.
  • RE resource element
  • a resource block (RB or physical resource block, PRB) in the frequency domain (110) contiguous subcarriers. in 5G systems 12, and the data rate may increase in proportion to the number of RBs scheduled for the UE.
  • a base station may map data in units of RBs and generally perform scheduling on an RB constituting one slot for a predetermined terminal. That is, in the 5G system, a basic time unit for performing scheduling may be a slot, and a basic frequency unit for performing scheduling may be an RB.
  • CP cyclic prefix
  • the ratio of the CP length to the symbol length is maintained at a constant value, the overhead due to the CP can be maintained constant regardless of the subcarrier interval. That is, when the subcarrier interval is small, the symbol length becomes long, and accordingly, the CP length may also be long. Conversely, if the subcarrier interval is large, the symbol length becomes short, and thus the CP length can be reduced.
  • the symbol length and CP length may be inversely proportional to the subcarrier spacing.
  • various frame structures can be supported by adjusting the subcarrier interval to satisfy various services and requirements. For example,
  • the symbol length in the time domain is shortened, and as a result, the slot length is shortened, which is advantageous for supporting ultra-low latency services such as URLLC.
  • a cell is a concept indicating an area covered by one base station in mobile communication.
  • Subcarrier spacing, CP length, etc. are essential information for OFDM transmission and reception, and smooth transmission and reception is possible only when the base station and the terminal recognize the subcarrier spacing and CP length as common values.
  • [Table 1] shows the subcarrier spacing configuration ( ⁇ ) and subcarrier spacing supported by the 5G system. , represents the relationship of CP length.
  • [Table 2] shows the number of symbols per slot for each subcarrier spacing setting ( ⁇ ) in the case of a general CP ), the number of slots per frame ( ), the number of slots per subframe ( ) shows
  • [Table 3] shows the number of symbols per slot for each subcarrier spacing setting ( ⁇ ) in the case of an extended CP ( ), the number of slots per frame ( ), the number of slots per subframe ( ).
  • frame structure B compared to the frame structure A is
  • the carrier interval and the RB size are doubled, and the slot length and symbol length are doubled.
  • 2 slots may constitute 1 subframe, and 20 subframes may constitute 1 frame.
  • essential parameter sets such as the subcarrier interval, CP length, and slot length have a relationship of integer multiples for each frame structure, thereby providing high scalability.
  • a subframe having a fixed length of 1 ms may be defined to indicate a reference time unit independent of a frame structure.
  • the frame structure can be applied in response to various scenarios.
  • the frame structure A can support a relatively larger cell than the frame structure B.
  • the frame structure B can support a relatively higher operating frequency than the frame structure A.
  • the shorter the slot length which is the basic time unit of scheduling, is advantageous to support ultra-low latency services such as URLLC, so the frame structure B may be more suitable for the URLLC service than the frame structure A.
  • uplink refers to a radio link in which a terminal transmits data or control signals to a base station
  • downlink refers to a radio link in which a base station transmits data or control signals to a base station. It may refer to a radio link that transmits a signal.
  • the terminal matches the downlink time and frequency synchronization from the synchronization signal transmitted by the base station through cell search, and the cell identifier (cell identifier) identifier (ID)) can be obtained.
  • the terminal may receive a physical broadcast channel (PBCH) using the obtained cell ID and obtain a master information block (MIB), which is essential system information, from the PBCH.
  • the terminal may receive system information (System Information Block, SIB) transmitted by the base station to obtain cell-common transmission/reception related control information.
  • SIB System Information Block
  • the cell common transmission/reception related control information may include random access related control information, paging related control information, common control information for various physical channels, and the like.
  • a synchronization signal is a reference signal for cell search, and a subcarrier interval may be applied for each frequency band to suit a channel environment such as phase noise.
  • a subcarrier interval may be applied according to service types in order to support various services as described above.
  • FIG. 2 shows an example of a time-domain mapping structure of a synchronization signal and a beam sweeping operation.
  • -PSS Primary Synchronization Signal
  • - SSS Secondary Synchronization Signal: serves as a standard for DL time/frequency synchronization and provides some remaining cell ID information. Additionally, it may serve as a reference signal for demodulation of the PBCH.
  • - PBCH Physical Broadcast Channel
  • MIB Master Information Block
  • the essential system information includes search space related control information indicating radio resource mapping information of a control channel, scheduling control information for a separate data channel for transmitting system information, and SFN (System Frame Number) and the like may be included.
  • the SS/PBCH block consists of N OFDM symbols and is composed of a combination of PSS, SSS, PBCH, etc.
  • the SS/PBCH block is the minimum unit to which beam sweeping is applied.
  • N 4 may be.
  • a base station can transmit up to L SS/PBCH blocks, and the L SS/PBCH blocks are mapped within a half frame (0.5 ms).
  • the L SS/PBCH blocks are periodically repeated in units of a predetermined period P. The period P may be informed by the base station to the terminal through signaling.
  • Each SS/PBCH block has an SS/PBCH block index from 0 to a maximum of L-1, and the UE can know the SS/PBCH block index through SS/PBCH detection.
  • FIG. 2 shows an example in which beam sweeping is applied in units of SS/PBCH blocks over time.
  • terminal 1 (205) receives an SS/PBCH block at time t1 (201) using a beam radiated toward #d0 (203) by beamforming applied to SS/PBCH block #0.
  • Terminal 2 206 receives the SS/PBCH block at time t2 202 using a beam emitted in the direction #d4 204 by beamforming applied to SS/PBCH block #4.
  • the terminal can obtain an optimal synchronization signal through a beam emitted from the base station in the direction in which the terminal is located. For example, it may be difficult for terminal 1 205 to obtain time/frequency synchronization and essential system information from an SS/PBCH block through a beam radiated in #d4 direction away from the location of terminal 1.
  • the UE may also receive the SS/PBCH block to determine whether the radio link quality of the current cell is maintained at a certain level or higher.
  • the terminal receives the SS/PBCH block of the neighboring cell to determine the radio link quality of the neighboring cell and acquire time/frequency synchronization of the neighboring cell. can do.
  • the terminal After the terminal acquires the MIB and system information from the base station through the initial access procedure, the terminal performs a random access procedure to switch the link with the base station to the connected state (RRC_CONNECTED state). can be done Upon completion of the random access procedure, the terminal is switched to a connected state, and one-to-one communication between the base station and the terminal is possible.
  • RRC_CONNECTED state Upon completion of the random access procedure, the terminal is switched to a connected state, and one-to-one communication between the base station and the terminal is possible.
  • a random access procedure will be described in detail with reference to FIG. 3 .
  • the terminal transmits a random access preamble to the base station.
  • the random access preamble which is the first transmission message of the terminal, may be referred to as message 1.
  • the base station may measure a transmission delay value between the terminal and the base station from the random access preamble and match uplink synchronization.
  • the terminal may arbitrarily select which random access preamble to use within the random access preamble set previously given by system information.
  • the initial transmission power of the random access preamble may be determined according to a pathloss between the base station and the terminal measured by the terminal.
  • the terminal may transmit the random access preamble by determining the transmission beam direction of the random access preamble from the synchronization signal received from the base station.
  • the base station transmits an uplink transmission timing adjustment command to the terminal based on the transmission delay value measured from the random access preamble received in step 1 310.
  • the base station may transmit an uplink resource and a power control command to be used by the terminal as scheduling information.
  • the scheduling information may include control information for the uplink transmission beam of the UE.
  • step 1 310 can proceed again. If the first step 310 is performed again, the terminal can increase the random access preamble reception probability of the base station by increasing the transmit power of the random access preamble by a predetermined step before transmitting (power ramping).
  • RAR random access response
  • the terminal transmits uplink data (message 3) including its own terminal ID to the base station using the uplink resources allocated in the second step 320, and uses the uplink data channel (Physical Uplink Shared Channel, PUSCH). ) is sent via Transmission timing of the uplink data channel for transmitting Message 3 may follow the timing control command received from the base station in step 2 320. Transmission power of the uplink data channel for transmitting Message 3 may be determined in consideration of the power control command received from the base station in step 2 320 and the power ramping value of the random access preamble.
  • the uplink data channel for transmitting Message 3 may mean a first uplink data signal transmitted by the UE to the base station after the UE transmits the random access preamble.
  • the base station transmits data (message 4) including the ID of the terminal that has transmitted the uplink data in the third step 330. transmitted to the terminal.
  • the terminal may determine that the random access is successful.
  • the terminal may transmit HARQ-ACK information indicating successful reception of message 4 to the base station through a physical uplink control channel (PUCCH).
  • PUCCH physical uplink control channel
  • the base station may not transmit any more data to the terminal. Accordingly, if the terminal does not receive data transmitted in step 4 340 from the base station within a predetermined time, it may be determined that the random access procedure has failed and start again from step 1 310.
  • the base station may receive a report of UE capability information from a UE in a connected state and adjust scheduling by referring to UE capability information of the corresponding UE.
  • the terminal may inform the base station of whether the terminal itself supports a predetermined function, the maximum allowable value of the function supported by the terminal, etc. through the UE capability information. Accordingly, the UE capability information reported by each terminal to the base station may be a different value for each terminal.
  • the terminal may report UE capability information including at least a part of the next control information as the UE capability information to the base station.
  • bandwidth-related control information When carrier aggregation (CA) is supported, bandwidth-related control information
  • FIG. 4 illustrates an example of a procedure for a UE to report UE capability information to a base station.
  • the base station 402 may transmit a UE capability information request message to the terminal 401.
  • the UE Upon request of UE capability information from the base station, the UE transmits UE capability information to the base station in step 420 .
  • Downlink Control Information is control information transmitted from a base station to a terminal through downlink, and may include downlink data scheduling information or uplink data scheduling information for a predetermined terminal.
  • DCI Downlink Control Information
  • a base station can independently channel-code DCI for each terminal and transmit the DCI to each terminal through a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the base station determines whether the downlink data is scheduling information (Downlink assignment), whether the uplink data is scheduling information (Uplink grant), or whether DCI is used for power control.
  • DCI format can be applied and operated.
  • the base station may transmit downlink data to the terminal through a physical downlink shared channel (PDSCH), which is a physical channel for transmitting downlink data.
  • PDSCH physical downlink shared channel
  • Scheduling information such as the specific mapping position of the PDSCH in the time and frequency domains, modulation method, HARQ-related control information, and power control information, is transmitted from the base station to the UE through DCI related to downlink data scheduling information among DCIs transmitted through the PDCCH. can tell you
  • the terminal may transmit uplink data to the base station through a physical uplink shared channel (PUSCH) for uplink data transmission.
  • PUSCH physical uplink shared channel
  • Scheduling information such as the specific mapping position of the PUSCH in the time and frequency domains, modulation method, HARQ-related control information, and power control information, will be informed by the base station to the UE through the DCI related to uplink data scheduling information among the DCIs transmitted through the PDCCH.
  • the time-frequency resource to which the PDCCH is mapped is called a control resource set (CORESET).
  • CORESET may be set to all or some frequency resources of the bandwidth supported by the terminal in the frequency domain. In the time domain, it can be configured with one or a plurality of OFDM symbols, which can be defined as a CORESET length (Control Resource Set Duration).
  • the base station may set one or a plurality of CORESETs to the terminal through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling). Setting the CORESET to the terminal may mean providing information such as a CORESET identifier (Identity), a frequency location of the CORESET, and a symbol length of the CORESET.
  • Information provided by the base station to the terminal to configure the CORESET may include at least some of the information included in ⁇ Table 4>.
  • the CORESET is in the frequency domain It can be composed of, and in the time domain It can consist of symbols.
  • the NR PDCCH may consist of one or a plurality of Control Channel Elements (CCEs).
  • CCEs Control Channel Elements
  • One CCE may consist of 6 REGs (Resource Element Groups), and a REG may be defined as 1 RB for 1 OFDM symbol.
  • REGs may be indexed in a time-first order, starting with REG index 0 from the first OFDM symbol and the lowest RB of the CORESET.
  • an interleaved method and a non-interleaved method may be supported.
  • the base station may set whether interleaving or non-interleaving transmission is performed for each CORESET to the terminal through higher layer signaling. Interleaving may be performed in units of REG bundles.
  • a REG bundle may be defined as a set of one or multiple REGs.
  • the UE may determine the CCE-to-REG mapping method in the corresponding CORESET based on interleaved or non-interleaved transmission set by the base station in the manner shown in Table 5 below.
  • the base station may notify the terminal of configuration information such as a symbol to which the PDCCH is mapped in a slot and a transmission period through signaling.
  • the search space of the PDCCH is described as follows.
  • the number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16 according to the aggregation level (AL), and the different numbers of CCEs can be used for link adaptation of the downlink control channel.
  • AL aggregation level
  • the different numbers of CCEs can be used for link adaptation of the downlink control channel.
  • AL aggregation level
  • one downlink control channel can be transmitted through L control channel elements (CCEs).
  • CCEs L control channel elements
  • the UE performs blind decoding to detect signals without knowing information about the downlink control channel.
  • a search space representing a set of CCEs may be defined.
  • the search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given aggregation level, and various aggregations that make one group with 1, 2, 4, 8, and 16 CCEs Since there are levels, the terminal can have a plurality of search spaces.
  • a search space set may be defined as a set of search spaces at all set aggregation levels.
  • the search space can be classified into a common search space (CSS) and a UE-specific search space (USS).
  • a certain group of terminals or all terminals can search the common search space of the PDCCH in order to receive cell-common control information such as dynamic scheduling for system information block (SIB) or paging messages.
  • SIB system information block
  • the terminal can receive scheduling allocation information of the PDSCH for system information reception by examining the common search space of the PDCCH.
  • a common search space since a certain group of terminals or all terminals must receive the PDCCH, it can be defined as a set of pre-promised CCEs.
  • Scheduling assignment information for the UE-specific PDSCH or PUSCH can be received by the UE by examining the UE-specific search space of the PDCCH.
  • the terminal-specific search space may be defined terminal-specifically as a function of the identity (ID) of the terminal and various system parameters.
  • the base station may set configuration information on the search space of the PDCCH to the terminal through higher layer signaling (eg, SIB, MIB, RRC signaling).
  • the base station includes the number of PDCCH candidate groups at each aggregation level L, a monitoring period for the search space, a monitoring occasion in symbol units within a slot for the search space, a search space type (common search space or UE-specific search space), A combination of a DCI format and an RNTI to be monitored in the search space, a CORESET index to be monitored in the search space, and the like can be set to the terminal.
  • the parameter for the search space for the PDCCH may include information as shown in Table 6 below.
  • the base station may set one or a plurality of search space sets for the terminal.
  • the base station may configure search space set 1 and search space set 2 for the terminal.
  • search space set 1 the terminal can be configured to monitor DCI format A scrambled with X-RNTI in a common search space
  • search space set 2 the terminal uses DCI format B scrambled with Y-RNTI in a terminal-specific search space. It can be set to monitor in
  • one or a plurality of search space sets may exist in a common search space or a terminal-specific search space.
  • search space set #1 and search space set #2 may be set as common search spaces
  • search space set #3 and search space set #4 may be set as terminal-specific search spaces.
  • the UE can monitor a combination of the following DCI format and RNTI.
  • DCI format a combination of the following DCI format and RNTI.
  • RNTI a combination of the following DCI format and RNTI.
  • the UE can monitor a combination of the following DCI format and RNTI.
  • DCI format a combination of the following DCI format and RNTI.
  • RNTI a combination of the following DCI format and RNTI.
  • the RNTIs may follow the following definitions and uses.
  • C-RNTI Cell RNTI
  • TC-RNTI Temporal Cell RNTI
  • CS-RNTI Configured Scheduling RNTI
  • RA-RNTI Random Access RNTI
  • P-RNTI Paging RNTI
  • SI-RNTI System Information RNTI
  • INT-RNTI Used to inform whether PDSCH is punctured or not
  • TPC-PUSCH-RNTI Transmit Power Control for PUSCH RNTI
  • TPC-PUCCH-RNTI Transmit Power Control for PUCCH RNTI
  • TPC-SRS-RNTI Transmit Power Control for SRS RNTI
  • search space of the aggregation level L in the CORESET p, search space set s can be expressed as the following equation.
  • the value may correspond to 0 in the case of a common search space.
  • the value may correspond to a value that changes according to the ID of the UE (C-RNTI or the ID set for the UE by the base station) and the time index.
  • a data rate can be increased through a spatial multiplexing method using a plurality of transmit/receive antennas.
  • the number of required power amplifiers (PAs) increases in proportion to the number of transmission antennas provided in a base station or terminal.
  • the maximum power of the base station and the terminal depends on the characteristics of the power amplifier, and in general, the maximum power of the base station depends on the cell size covered by the base station. Usually, the maximum output is expressed in dBm.
  • the maximum output of the terminal is usually 23dBm or 26dBm.
  • the base station is provided with 64 transmission antennas and corresponding 64 power amplifiers in a 3.5 GHz frequency band and can operate in a 100 MHz bandwidth.
  • the energy consumption of the base station increases in proportion to the output of the power amplifier and the operating time of the power amplifier.
  • 5G base stations have a relatively high operating frequency band and are characterized by having a wide bandwidth and many transmit antennas. While this feature has the effect of increasing the data rate, the cost of increasing the energy consumption of the base station occurs. Therefore, as the number of base stations constituting the mobile communication network increases, energy consumption of the entire mobile communication network increases in proportion thereto.
  • the energy consumption of the base station is greatly influenced by the operation of the power amplifier. Since the power amplifier is involved in the transmission operation of the base station, the downlink (DL) transmission operation of the base station is highly related to energy consumption of the base station. Relatively, the uplink (UL) reception operation of the base station does not account for a high portion of energy consumption of the base station.
  • a physical channel and a physical signal transmitted by the base station through downlink are as follows.
  • - PDSCH Physical Downlink Shared Channel: Downlink data channel including data to be transmitted to one or more terminals
  • -PDCCH Physical Downlink Control Channel
  • control information such as a slot format and a power control command may be transmitted through a PDCCH alone without a PDSCH or PUSCH to be scheduled.
  • the scheduling information includes resource information to which PDSCH or PUSCH is mapped, HARQ related information, power control information, and the like.
  • - PBCH Physical Broadcast Channel: A downlink broadcast channel that provides MIB (Master Information Block), which is essential system information required for transmission and reception of a data channel and control channel of a terminal.
  • MIB Master Information Block
  • -PSS Primary Synchronization Signal
  • - SSS Secondary Synchronization Signal: A signal that serves as a reference for DL time and/or frequency (hereinafter referred to as time/frequency) synchronization and provides some remaining cell ID information.
  • - DM-RS Demodulation Reference Signal: Reference signal for channel estimation of the terminal for each of PDSCH, PDCCH, and PBCH
  • - CSI-RS Channel-state Information Reference Signal
  • the energy saving effect of the base station due to the stop of the power amplifier operation can be increased. Operations of not only the power amplifier but also other base station devices such as baseband devices are reduced, so additional energy savings are possible. Similarly, even if the uplink reception operation takes up a relatively small proportion of the total energy consumption of the base station, an additional energy saving effect can be obtained if the uplink reception operation can be stopped.
  • the downlink transmission operation of the base station is basically dependent on the amount of downlink traffic. For example, if there is no data to be transmitted to the terminal in downlink, the base station does not need to transmit the PDSCH and the PDCCH for scheduling the PDSCH. Alternatively, if transmission of the data can be temporarily suspended for reasons such as not being sensitive to transmission delay, the base station may not transmit PDSCH and/or PDCCH. For convenience of description below, a method of reducing energy consumption of a base station by not transmitting PDSCH and/or PDCCH related to data traffic or by appropriately adjusting the transmission is referred to as 'Base Station Energy Saving Method 1-1'.
  • the operation of the power amplifier of the base station and related RF devices, baseband devices, etc. By stopping or minimizing the operation, the energy saving effect of the base station can be maximized.
  • energy consumption of the base station can be reduced by switching off part of the antenna or power amplifier of the base station (hereinafter referred to as 'base station energy saving method 2').
  • 'base station energy saving method 2' energy consumption of the base station can be reduced by switching off part of the antenna or power amplifier of the base station.
  • an adverse effect such as a decrease in cell coverage or a decrease in throughput may be accompanied.
  • a base station equipped with 64 transmit antennas and corresponding 64 power amplifiers in the 3.5 GHz frequency band as described above and operating in a 100 MHz bandwidth has four transmit antennas for a predetermined time interval to save base station energy.
  • a base station mode in which an operation for saving base station energy is applied is referred to as a base station energy saving mode (ES mode)
  • ES mode base station energy saving mode
  • Normal mode base station normal mode
  • CC component carrier
  • CA carrier aggregation
  • Carrier aggregation technology increases the total frequency bandwidth by combining individual component carriers with relatively small bandwidths when a mobile communication service provider cannot secure a frequency with a bandwidth sufficient to provide high-speed data service with a single component carrier. High-speed data service can be made possible.
  • the frequency band utilized by the 5G system is wide ranging from hundreds of MHz to tens of GHz.
  • the lower the frequency band the larger the coverage due to relatively small pathloss, and the larger the frequency band, the smaller the coverage due to relatively high pathloss.
  • the available frequencies for mobile communication are relatively small and the bandwidth is small, whereas in the high frequency band, it is relatively easy to secure a wide bandwidth frequency, which is suitable for high-speed data service.
  • the 6G ( 6th generation) mobile communication system which is a next-generation mobile communication system, considers the THz (Terahertz, 10 12 Hz) band as one of the candidate frequencies.
  • THz Transmissionhertz
  • a mobile communication operator may operate a system combining LTE and 5G by combining a previously secured frequency band for an LTE system and a newly secured frequency band for a 5G system.
  • a mobile communication operator may provide a mobile communication service through 5G CA by securing a frequency band for a 5G system across multiple bands and then combining frequencies of the multiple bands.
  • characteristics such as coverage and bandwidth vary according to frequency bands, a mobile communication service combining multiple frequency bands is becoming increasingly active rather than a mobile communication service relying on a single frequency band.
  • the first embodiment describes a communication system structure in which frequencies of several bands are combined to enhance frequency use efficiency.
  • the frequencies may be directly adjacent or apart in the frequency domain.
  • FIG. 6 shows an example of a communication system composed of an access carrier and a data carrier.
  • the communication system of FIG. 6 includes a carrier operating at frequency F1 (hereinafter referred to as 'access carrier' for convenience of explanation, 601) and a carrier operating at frequency F2 (hereinafter referred to as 'data carrier', 602). ') (F1 ⁇ F2).
  • F1 is advantageous in coverage because of its relatively low frequency band, but has limitations in providing high-speed data service due to bandwidth constraints.
  • F2 has a relatively weak coverage due to its relatively high frequency band, but has an advantage in high-speed data service with a relatively wide bandwidth.
  • the size of the circle shown in FIG. 6 indicates the size of coverage that each carrier can provide. In the example of FIG.
  • the base station may be a combination of 'access carrier' and 'data carrier', or 'access carrier' and 'data carrier' may be implemented as separate base stations. If 'access carrier' and 'data carrier' are implemented as one base station, 'access carrier' and 'data carrier' may be referred to as transmission reception points (TRPs) using different frequencies, respectively.
  • TRPs transmission reception points
  • An 'access carrier' may be implemented as a base station that transmits a signal through a frequency resource corresponding to the 'access carrier'.
  • the 'data carrier' may be implemented as a base station that transmits a signal through a frequency resource corresponding to the 'data carrier'.
  • the 'access carrier' serves to provide essential information of the communication system, such as the aforementioned synchronization signal, PBCH, and system information, and switches on to support all terminals in the system regardless of the status of the terminal. keep The base station in the switched-on state maintains power to the transmission block and the reception block and performs normal transmission and reception operations. The terminal performs an initial access operation through an 'access carrier'.
  • the 'data carrier' switches between a switched on state and a switched off state as needed. In the switch-off state, the power of the base station is partially or completely turned off.
  • a 'data carrier' is switched on to service a terminal in a connected state that has completed initial access, and if there is no terminal to service, it is switched to an off state to prevent unnecessary energy consumption of the base station.
  • the 'data carrier' can increase frequency efficiency by omitting or minimizing the transmission of essential information provided to the terminal.
  • the first embodiment can be described by classifying it into the following scenarios according to whether or not it is an initial access stage.
  • the state of the UE can be largely classified into a connected state (eg, connected state or RRC_CONNECTED state) and an idle state (eg, Idle state or RRC_IDLE state).
  • a connected state eg, connected state or RRC_CONNECTED state
  • an idle state eg, Idle state or RRC_IDLE state.
  • the terminal performs a series of initial access (initial access) synchronization with the base station, obtaining system information from the base station, and performing a random access procedure. ) procedure.
  • the terminal state in the initial access stage is called the idle state.
  • the initial access step is completed, the terminal is now switched to the connected state and can perform one-to-one data transmission and reception with the base station.
  • FIG. 7 shows an example of an operating scenario of a communication system composed of an access carrier and a data carrier.
  • Scenario 1-1 A scenario in which a terminal performs initial access with a base station.
  • FIG. 7 shows a system composed of an 'access carrier' 701 and a 'data carrier' (710, 720, 730, 740, 750). This is a case where there is no terminal in a connected state in the current system.
  • the 'access carrier' maintains a switched-on state to support all terminals in the system regardless of the state of the terminal.
  • the 'data carrier' maintains the switched-off state and expects the base station energy saving effect.
  • the terminal in the idle state obtains a synchronization signal, system information, etc. from the 'access carrier', and performs a random access procedure with the 'access carrier' based on this.
  • FIG. 8 shows an example of an operating scenario of a communication system composed of an access carrier and a data carrier.
  • Scenario 1-2 Another scenario in which a terminal performs initial access with a base station.
  • FIG. 8 shows a system composed of an 'access carrier' 801 and a 'data carrier' (810, 820, 830, 840, 850).
  • the 'access carrier' maintains a switched-on state to support all terminals in the system regardless of the status of the terminal.
  • some of the 'data carriers' (840 and 850, hereinafter referred to as 'data carrier set#1') maintain a switch-off state in both transmission and reception operations, so that a base station energy saving effect is expected.
  • 'data carrier set#2' Some other 'data carriers' (810, 820, 830, hereinafter referred to as 'data carrier set#2') are switched off in transmission operation but switched on in reception operation, thereby expecting a partial base station energy saving effect.
  • the terminal in the idle state acquires synchronization signals and system information from the 'access carrier' and performs a random access procedure based on this.
  • the random access procedure may be performed for 'access carrier' or 'data carrier set#2'.
  • An 'access carrier' or 'data carrier set#2' may receive an uplink signal transmitted by a terminal during a random access procedure.
  • FIG 9 shows an example of an operating scenario of a communication system composed of an access carrier and a data carrier.
  • Scenario 2 A scenario in which a terminal communicates with a base station
  • the terminal that has completed the initial access procedure can perform one-to-one data communication with the 'data carrier'.
  • a 'data carrier' 910 is determined to be the most suitable base station for servicing a terminal in a currently connected state, and the 'data carrier' 910 is switched on to perform one-to-one data communication with the terminal.
  • the 'data carrier' 910 is switched on to perform one-to-one data communication with the terminal.
  • the control information related to the threshold value A and the threshold value B can be set by the base station through signaling to the terminal in advance.
  • 'data carriers' that do not satisfy the switch-on condition remain in a switched-off state, and an energy saving effect of the base station is expected.
  • the 'access carrier' can decide whether to switch on or off the 'data carrier' and notify the corresponding 'data carrier' through signaling.
  • Scenario 2 can be modified in various ways in relation to the operation between the terminal and the 'access carrier'.
  • the terminal once the terminal performs data communication with the switched-on 'data carrier', the terminal no longer performs data communication with the 'access carrier'. That is, at any moment, the terminal performs data communication with one base station.
  • operations such as the terminal receiving a synchronization signal from the 'access carrier' and obtaining system information are still possible.
  • the terminal can perform data communication with the 'access carrier'. That is, at any moment, the terminal can perform data communication simultaneously with the 'access carrier' and the 'data carrier'. In this case, the terminal performs relatively high-speed data transmission and reception with the 'data carrier' and relatively low-speed data transmission and reception with the 'access carrier'.
  • the second embodiment describes a random access procedure between a terminal and a base station.
  • the main points of the second embodiment are as follows.
  • the random access preamble transmitted from the terminal to the base station is divided into two steps and applied.
  • the terminal transmits a random access preamble to the 'access carrier', and the random access preamble includes information on the 'data carrier' that the terminal intends to access in the next step.
  • the terminal transmits the random access preamble to the 'data carrier' and performs an operation to match the time-frequency synchronization between the terminal and the 'data carrier'.
  • the random access preamble transmitted by the terminal and the 'data carrier' are interconnected. For example, if the terminal transmits random access preamble #1, this may indicate that the terminal wants to access 'data carrier #1'.
  • the interconnection relationship may be pre-promised between the terminal and the base station, or the base station may set and inform the terminal as system information.
  • the 'access carrier' obtains information about the 'data carrier' that the terminal wants to access from the random access preamble received from the terminal, and by referring to this, determines to switch on the 'data carrier' and switches on the 'data carrier' It can be instructed through signaling.
  • the 'data carrier' switched to the switched-on state transmits a reference signal so that the terminal can measure the channel quality state of the 'data carrier'.
  • FIG. 10 illustrates an example of a random access procedure in a wireless communication system according to various embodiments of the present disclosure.
  • step 1001 the terminal receives a synchronization signal, PBCH, system information, etc. from the 'access carrier', matches time-frequency synchronization with the 'access carrier', and acquires information necessary for a random access procedure. Also, in step 1001, the terminal acquires control information (hereinafter referred to as 'control information #1') for one or more 'data carriers' connected to the 'access carrier'.
  • the 'control information #1' may be included in a synchronization signal, PBCH, system information, etc. received by the terminal from the 'access carrier' and transmitted.
  • the 'control information #1' may include control information for a reference signal such as SSB or CSI-RS required for the terminal to measure the channel quality state of the corresponding 'data carrier'.
  • the 'control information #1' may include frequency information on the 'data carrier' connected to the 'access carrier'.
  • the terminal starts a random access procedure by transmitting a random access preamble to an 'access carrier' based on the information obtained in step 1001.
  • the initial transmit power and transmit beam direction of the random access preamble may be determined by the UE according to the synchronization signal of the 'access carrier' measured in step 1001. If the terminal does not receive a response to the transmission of the random access preamble from the base station, the terminal may transmit the random access preamble again.
  • the random access preamble transmitted by the UE in step 1002 may explicitly or implicitly include information on a 'data carrier' preferred by the UE. For example, the terminal may select a 'data carrier' having the best channel quality among several 'data carriers' and inform the 'access carrier' of the selected 'data carrier'.
  • the 'access carrier' successfully detects the random access preamble transmitted by the terminal. Accordingly, the 'access carrier' also obtains information on the 'data carrier' preferred by the terminal, and determines the 'data carrier' to switch to the switched-on state (or wake-up) by referring to this information.
  • step 1004 the 'access carrier' instructs the 'data carrier' to switch to the switched-on state through signaling.
  • the 'data carrier' may respond to the 'access carrier' that it has successfully received the indication.
  • step 1005 the 'data carrier' switches to the switch on state according to the instruction of the 'access carrier' and starts transmitting the reference signal.
  • the reference signal may be SSB or CSI-RS.
  • step 1006 the 'access carrier' instructs the terminal to perform a random access procedure with the 'data carrier'.
  • step 1007 the terminal successfully detects the reference signal transmitted by the 'data carrier'. As a result, the terminal can match time-frequency synchronization with the 'data carrier'.
  • step 1008 the UE starts a random access procedure by transmitting a random access preamble through a 'data carrier'.
  • the initial transmission power and transmission beam direction of the random access preamble may be determined by the terminal according to the reference signal of the 'data carrier' measured in step 1007 above.
  • the 'data carrier' If the 'data carrier' successfully detects the random access preamble transmitted by the terminal in step 1009, the 'data carrier' transmits a random access response signal to the terminal in step 1010.
  • step 1011 the terminal transmits message 3 of the random access procedure to the 'data carrier', and in response to this, the 'data carrier' transmits message 4 to the terminal in step 1012, thereby completing the random access procedure.
  • the terminal may perform one-to-one data communication with the 'data carrier'.
  • the terminal may start again from step 1002 or step 1008. At this time, the 'data carrier' may instruct the terminal from which step to start again or may operate according to the terminal's own judgment.
  • the second embodiment can be modified in various ways.
  • the signal transmitted from the 'access carrier' to the terminal in step 1006 may be replaced with a response signal to the random access preamble sent from the terminal to the 'access carrier' in step 1002.
  • the random access procedure between the terminal and the 'access carrier' may be completed by transmitting and receiving message 3 and message 4 between the terminal and the 'access carrier'.
  • the third embodiment describes a random access procedure of a terminal and a base station in a method different from that of the second embodiment.
  • the third embodiment basically follows the operation of the second embodiment, but has the following additional features.
  • the third embodiment operates by including an access and mobility management function (AMF), which is a network entity responsible for functions such as terminal authentication, security, and mobility management in the system.
  • AMF access and mobility management function
  • the AMF determines a 'data carrier' to switch to a switched-on state by referring to information provided from an 'access carrier', and instructs the 'data carrier' to switch-on through signaling.
  • FIG. 11 illustrates an example of a random access procedure in a wireless communication system according to various embodiments of the present disclosure.
  • step 1101 the terminal receives a synchronization signal, PBCH, system information, etc. from the 'access carrier', matches time-frequency synchronization with the 'access carrier', and acquires information necessary for a random access procedure. Also, in step 1101, the terminal obtains control information (hereinafter referred to as 'control information #1') for one or more 'data carriers' connected to the 'access carrier'.
  • the 'control information #1' may be included in a synchronization signal, PBCH, system information, etc. received by the terminal from the 'access carrier' and transmitted.
  • the 'control information #1' may include control information for a reference signal such as SSB or CSI-RS required for the terminal to measure the channel quality state of the corresponding 'data carrier'.
  • the 'control information #1' may include frequency information on the 'data carrier' connected to the 'access carrier'.
  • the terminal starts a random access procedure by transmitting a random access preamble to the 'access carrier' based on the information acquired in step 1101.
  • the initial transmission power and transmission beam direction of the random access preamble may be determined by the UE according to the synchronization signal of the 'access carrier' measured in step 1101. If the terminal does not receive a response to the transmission of the random access preamble from the base station, the terminal may transmit the random access preamble again.
  • the random access preamble transmitted by the UE in step 1102 may explicitly or implicitly include information on a 'data carrier' preferred by the UE. For example, the terminal may select a 'data carrier' having the best channel quality among several 'data carriers' and inform the 'access carrier' of the selected 'data carrier'.
  • step 1103 the 'access carrier' successfully detects the random access preamble transmitted by the terminal. Accordingly, the 'access carrier' also acquires information about the 'data carrier' preferred by the terminal.
  • step 1104 the 'access carrier' transfers information about the 'data carrier' preferred by the terminal obtained from the terminal to the AMF.
  • step 1105 the AMF determines the 'data carrier' to switch to the switched-on state, and informs the 'access carrier' that the terminal will be managed by the 'data carrier'.
  • step 1106 the AMF instructs the 'data carrier' to switch to the switched-on state through signaling.
  • the 'data carrier' may respond to the 'access carrier' that it has successfully received the indication.
  • the 'data carrier' switches to the switch on state according to the instruction of the AMF and starts transmitting the reference signal.
  • the reference signal may be SSB or CSI-RS.
  • step 1108 the 'access carrier' instructs the terminal to perform a random access procedure with the 'data carrier'.
  • step 1109 the terminal successfully detects the reference signal transmitted by the 'data carrier'. As a result, the terminal can match time-frequency synchronization with the 'data carrier'.
  • step 1110 the UE starts a random access procedure by transmitting a random access preamble through a 'data carrier'.
  • the initial transmission power and transmission beam direction of the random access preamble may be determined by the terminal according to the reference signal of the 'data carrier' measured in step 1109 above.
  • the 'data carrier' If the 'data carrier' successfully detects the random access preamble transmitted by the terminal in step 1111, the 'data carrier' transmits a random access response signal to the terminal in step 1112.
  • step 1113 the terminal transmits message 3 of the random access procedure to the 'data carrier', and in response to this, the 'data carrier' transmits message 4 to the terminal in step 1114, thereby completing the random access procedure.
  • the terminal may perform one-to-one data communication with the 'data carrier'.
  • the terminal may start again from step 1102 or step 1110. At this time, the 'data carrier' may instruct the terminal from which step to start again or may operate according to the terminal's own judgment.
  • the third embodiment can be modified in various ways.
  • the signal sent from the 'access carrier' to the terminal in step 1108 can be replaced with a response signal to the random access preamble sent from the terminal to the 'access carrier' in step 1102.
  • the random access procedure between the terminal and the 'access carrier' may be completed by transmitting and receiving message 3 and message 4 between the terminal and the 'access carrier'.
  • the fourth embodiment describes a random access procedure of a terminal and a base station in a method different from those of the second and third embodiments. Compared to the second and third embodiments, the fourth embodiment has the following additional features.
  • the fourth embodiment operates in a two-step procedure when the 'data carrier' switches to the switch-on state according to the instruction of the AMF. In the first step, the 'data carrier' switches only the reception function to a switched-on state while maintaining the transmission function in a switched-off state. As a second step, if the 'data carrier' successfully detects the random access preamble from the terminal, the 'data carrier' additionally switches the transmission function to a switched-on state and then starts transmitting the reference signal.
  • FIG. 12 illustrates an example of a random access procedure in a wireless communication system according to various embodiments of the present disclosure.
  • step 1201 the terminal receives a synchronization signal, PBCH, system information, etc. from the 'access carrier', matches time-frequency synchronization with the 'access carrier', and acquires information necessary for a random access procedure. Also, in step 1201, the terminal acquires control information (hereinafter referred to as 'control information #1') for one or more 'data carriers' connected to the 'access carrier'.
  • the 'control information #1' may be included in a synchronization signal, PBCH, system information, etc. received by the terminal from the 'access carrier' and transmitted.
  • the 'control information #1' may include control information for a reference signal such as SSB or CSI-RS required for the terminal to measure the channel quality state of the corresponding 'data carrier'.
  • the 'control information #1' may include frequency information on the 'data carrier' connected to the 'access carrier'.
  • the terminal starts a random access procedure by transmitting a random access preamble to an 'access carrier' based on the information obtained in step 1201.
  • the initial transmission power and transmission beam direction of the random access preamble may be determined by the UE according to the synchronization signal of the 'access carrier' measured in step 1201. If the terminal does not receive a response to the transmission of the random access preamble from the base station, the terminal may transmit the random access preamble again.
  • the random access preamble transmitted by the UE in step 1202 may explicitly or implicitly include information on the 'data carrier' preferred by the UE. For example, the terminal may select a 'data carrier' having the best channel quality among several 'data carriers' and inform the 'access carrier' of the selected 'data carrier'.
  • step 1203 the 'access carrier' successfully detects the random access preamble transmitted by the terminal. Accordingly, the 'access carrier' also acquires information about the 'data carrier' preferred by the terminal.
  • step 1204 the 'access carrier' transfers information about the terminal's preferred 'data carrier' obtained from the terminal to the AMF.
  • step 1205 the AMF determines the 'data carrier' to switch to the switched-on state, and informs the 'access carrier' that the terminal will be managed by the 'data carrier'.
  • step 1206 the AMF instructs the 'data carrier' to be switched to the switched-on state to switch the receiving function to the switched-on state through signaling.
  • the 'data carrier' may respond to the 'access carrier' that it has successfully received the indication.
  • step 1207 the 'data carrier' switches the receiving function to a switched-on state according to the instruction of the AMF, and attempts to detect the random access preamble of the terminal.
  • step 1208 the 'access carrier' instructs the terminal to perform a random access procedure with the 'data carrier'. At this time, the 'access carrier' may inform the terminal of the initial transmit power and transmit beam direction of the random access preamble.
  • step 1209 the UE starts a random access procedure by transmitting a random access preamble through a 'data carrier'.
  • the 'data carrier' If the 'data carrier' successfully detects the random access preamble transmitted by the UE in step 1210, the 'data carrier' switches on the transmission function and transmits the reference signal in step 1211.
  • the reference signal may be SSB or CSI-RS.
  • the terminal can match the time-frequency synchronization with the 'data carrier' from the reference signal transmitted by the 'data carrier'.
  • step 1212 the 'data carrier' transmits a random access response signal to the terminal.
  • step 1213 the terminal transmits message 3 of the random access procedure to the 'data carrier', and in response to this, the 'data carrier' transmits message 4 to the terminal in step 1214, thereby completing the random access procedure.
  • the terminal may perform one-to-one data communication with the 'data carrier'.
  • Successful detection of the random access preamble of the 'data carrier' in step 1210 is a prerequisite for the 'data carrier' to completely switch to the switched-on state. If the 'data carrier' fails to detect the random access preamble in step 1210, the terminal may start again from step 1202 or step 1209. At this time, the 'data carrier' may instruct the terminal from which step to start again or may operate according to the terminal's own judgment.
  • the fourth embodiment can be modified in various ways.
  • the signal transmitted from the 'access carrier' to the terminal in step 1208 may be replaced with a response signal to the random access preamble sent from the terminal to the 'access carrier' in step 1202.
  • the random access procedure between the terminal and the 'access carrier' may be completed by transmitting and receiving message 3 and message 4 between the terminal and the 'access carrier'.
  • the fifth embodiment describes a specific method of establishing an interconnection relationship between the random access preamble and 'data carrier' described in the previous embodiments.
  • the terminal can inform the base station which 'data carrier' is appropriate to switch to the switched-on state because the channel quality state is excellent with the terminal through random access preamble transmission in the initial access stage.
  • the channel quality state between the terminal and the base station is affected by the distance between the terminal and the base station, whether or not there is an obstacle between the terminal and the base station, and the like. That is, the location information of the terminal in the cell becomes a major factor in determining the channel quality state between the terminal and the 'data carrier'. If a terminal or a base station misjudges a 'data carrier' to be switched on, by switching on an inappropriate 'data carrier', unnecessary energy consumption of the base station may occur and the data rate available to the terminal may be adversely affected.
  • the base station can grasp the location information of the terminal with a certain level of accuracy or higher through a process of measuring the position of the terminal of the base station, measuring and reporting the position of the terminal, for the terminal in the connected state.
  • the fifth embodiment is a random access preamble and a 'data carrier' supporting a terminal in an initial access stage to switch a 'data carrier' to a switched-on state by recognizing its location information and providing related information to a base station. Define the interconnection relationship with
  • FIG. 13 shows an example of an interconnection relationship between a random access preamble and a data carrier.
  • 13 assumes a case in which five 'data carriers' are configured within the coverage of an 'access carrier'. 13 shows a case in which a UE is divided into three regions, namely Region A, Region B, and Region C, according to the location of a UE within the coverage of an 'access carrier'. After determining which region it is located within the coverage of the 'access carrier', the terminal initiates a random access procedure using a random access preamble associated with the corresponding region. The 'access carrier' determines which 'data carrier' to switch on from the random access preamble detected from the terminal.
  • the following ⁇ Equation 2> between the location (region) of the UE's cell, the random access preamble group, and the data carrier is pre-promised between the UE and the BS.
  • the interconnection relationship may be informed by the base station to the terminal through system information or may be defined according to a predetermined rule.
  • the random access preamble group represents a group composed of at least one random access preamble.
  • the UE if the UE is located in region C, the UE initiates a random access procedure using a random access preamble in random access preamble group C. If the 'access carrier' successfully detects the random access preamble transmitted by the terminal, it is determined to switch the 'data carrier' 1350 interconnected with the corresponding area or random access preamble group into a switched-on state.
  • the UE measures the SSB transmitted by the 'access carrier' in order to determine its location. As described above with reference to FIG. 2, when the SSB is received, the terminal can know the SSB index. From the characteristics of the SSB that is beam-sweeped, an approximate relationship between the SSB index and the location of the UE can be mapped. For example, in the case of FIG. 13, SSB#0 and SSB#1 can be mapped to region A, SSB#2 and SSB#3 to region B, and SSB#4 and SSB#5 to region C. Therefore, for example, if the UE has measured that the received signal quality of SSB#4 is the best, the UE can determine that it is located in region C mapped with SSB#4.
  • FIG. 14 shows an example of an interconnection relationship between a random access preamble and a data carrier.
  • the terminal can determine its location by measuring the received signal strength of the SSB received from the 'access carrier'. For example, the relationship between the received signal strength of the SSB and the location of the terminal can be mapped as shown in Equation 3 below.
  • threshold value 1 > threshold value 2 > threshold value 3 the SSB reception signal strength is greater as it is closer to the center of the 'access carrier', and the SSB forward signal strength decreases as it is farther from the center of the 'access carrier' exemplify the case
  • the threshold value 1, threshold value 2, and threshold value 3 may be notified to the base station terminal through system information.
  • the terminal determines that the terminal is located in area B according to ⁇ Equation 3> from the measured SSB received signal strength, the terminal is randomly connected to the area B according to ⁇ Equation 2>.
  • the random access procedure is initiated using the random access preamble of the access preamble group B. If the 'access carrier' successfully detects the random access preamble transmitted by the terminal, it is determined to switch the 'data carrier' (1430 or 1450) interconnected with the corresponding area or random access preamble group into a switched-on state.
  • 15 shows an example of an interconnection relationship between a random access preamble and a data carrier.
  • the 15 shows that five 'data carriers' are configured within the coverage of the 'access carrier', and five areas of Area A, Area B, Area C, Area D, and Area E are located according to the location of the terminal within the coverage of the 'access carrier'. represents the case of division by .
  • the direction from the center of the 'access carrier' to the terminal can be determined in the case of the method of FIG. 13, and between the center of the 'access carrier' and the terminal in the case of the method of FIG. 14
  • the location of the terminal can be determined considering both direction and distance. For example, in the case of FIG.
  • the terminal can specify its location by determining the direction of the 'access carrier' from the center of the cell using the acquired SSB index.
  • the terminal can finally determine region E belonging to the common region of region group #1 and region group #2 as its own location. Thereafter, the terminal initiates a random access procedure by transmitting a random access preamble belonging to a random access preamble group interconnected with region E according to the rule of Equation 2 above.
  • the 'access carrier' successfully detects the random access preamble transmitted by the terminal, it is determined to switch the 'data carrier' 1520 interconnected with the corresponding region or random access preamble group into a switched-on state.
  • the criterion for location measurement of the terminal has been described based on the SSB transmitted by the 'access carrier', but is not necessarily limited thereto.
  • the UE can measure its location by measuring CSI-RS or other reference signals that provide a function similar to the SSB.
  • the terminal may measure its own location by having a separate and independent location measurement function.
  • the fifth embodiment has described a method of providing location information of a terminal to a base station from a random access preamble transmitted by a terminal as shown in Equation 2 above, but is not limited thereto.
  • the terminal may include information related to the location of the terminal or information related to the 'data carrier' preferred by the terminal in message 3 transmitted to the base station during the random access process.
  • the random access preamble and the 'data carrier' are interconnected according to the location of the terminal, but the interconnection relationship can be defined in various ways without being limited thereto.
  • the size of uplink data to be transmitted by the terminal may be limited so that the size of the terminal becomes smaller as the location of the terminal moves away from the center of the cell, and the random access preamble, data size, and interconnection relationship of 'data carrier' may be defined. .
  • the sixth embodiment an example of a terminal procedure and a base station procedure according to a preferred embodiment of the present invention will be described.
  • the terminal procedure and the base station procedure of the sixth embodiment may be performed in combination with at least one of the first to fifth embodiments.
  • FIG. 16 illustrates an example of a terminal procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 16 is a diagram illustrating an example of a terminal procedure applying this when a base station combines and operates an 'access carrier' and a 'data carrier' according to an embodiment of the present invention.
  • the terminal receives a reference signal from an 'access carrier'.
  • the reference signal includes SSB or CSI-RS. Additionally, the terminal receives system information from the 'access carrier'.
  • the system information may include the interconnection relationship between the random access preamble and the 'data carrier' described above.
  • the terminal transmits a random access preamble to the 'access carrier'.
  • the random access preamble may include information about a 'data carrier' preferred by the terminal.
  • step 1603 the terminal is instructed to perform a random access procedure from the 'access carrier' to the 'data carrier'.
  • step 1604 the terminal receives a reference signal from the 'data carrier'.
  • step 1605 the terminal proceeds to a random access procedure with a 'data carrier'. If the random access procedure is successfully completed, the terminal can perform one-to-one data communication with the 'data carrier' in a later step.
  • steps 1604 and 1605 may be changed and applied.
  • FIG. 17 illustrates an example of an access carrier procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 17 is a diagram illustrating an example of a procedure of an 'access carrier' applying the combined operation of an 'access carrier' and a 'data carrier' according to an embodiment of the present invention.
  • the 'access carrier' transmits a reference signal to the terminal.
  • the 'access carrier' may transmit system information including the interconnection relationship between the aforementioned random access preamble and the 'data carrier' to the terminal.
  • the 'access carrier' successfully detects the random access preamble transmitted by the terminal.
  • the 'access carrier' also obtains information on the 'data carrier' preferred by the terminal from the random access preamble that has been successfully detected, and determines the 'data carrier' to switch to the switched-on state (or wake-up) by referring to this information do.
  • step 1703 the 'access carrier' instructs the 'data carrier' determined in step 1702 to switch to a switch-on state through signaling.
  • step 1704 the 'access carrier' instructs the terminal to perform a random access procedure with the 'data carrier'.
  • step 1703 the 'access carrier' provides information on the 'data carrier' obtained from the terminal to the AMF, and the terminal is retrieved from the AMF. It can be replaced with an operation of being notified that the 'data carrier' will manage it.
  • FIG. 18 illustrates an example of a data carrier procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 18 is a diagram illustrating an example of a procedure of a 'data carrier' applying the 'access carrier' and a 'data carrier' when combined and operated according to an embodiment of the present invention.
  • step 1801 the 'data carrier' is instructed to transition from the 'access carrier' to the switched-on state.
  • step 1802 the 'data carrier' switches to a switched-on state.
  • step 1803 the 'data carrier' transmits a reference signal to the terminal.
  • step 1804 the 'data carrier' performs a random access procedure with the terminal. If the random access procedure is successfully completed, the 'data carrier' and the terminal may perform one-to-one data communication in a later step.
  • step 1801 may be replaced with an operation in which the 'data carrier' is instructed to switch from the AMF to the switched-on state.
  • FIG. 19 illustrates an example of a data carrier procedure in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 19 is a diagram illustrating another example of a procedure of a 'data carrier' applying the 'access carrier' and a 'data carrier' when combined and operated according to an embodiment of the present invention.
  • step 1901 the 'data carrier' is instructed to switch to the switched-on state from the AMF.
  • step 1902 the 'data carrier' partially switches to a switched-on state. For example, only the reception function of 'data carrier' can be switched into a switched-on state.
  • step 1903 the 'data carrier' successfully detects the random access preamble transmitted by the terminal.
  • step 1904 the 'data carrier' converts both the transmitting function and the receiving function into a switched-on state. Then, the reference signal is transmitted to the terminal.
  • step 1905 the 'data carrier' continues the remaining random access procedure. If the random access procedure is successfully completed, the 'data carrier' and the terminal may perform one-to-one data communication in a later step.
  • FIG. 20 illustrates a terminal transceiver in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 20 is a diagram illustrating an example of a terminal transceiving device in a wireless communication system according to an embodiment of the present disclosure.
  • the illustration and description of devices not directly related to the present disclosure may be omitted.
  • a terminal includes a transmitter 2004 composed of an uplink transmission processing block 2001, a multiplexer 2002, and a transmission RF block 2003, a downlink reception processing block 2005, and a demultiplexer 2006 ), a receiving unit 2008 composed of a receiving RF block 2007 and a control unit 2009.
  • the control unit 2009 controls each component block of the receiver 2008 for receiving a data channel or control channel transmitted by the base station and each component block of the transmitter 2004 for transmitting an uplink signal. can do.
  • the uplink transmission processing block 2001 in the transmitter 2004 of the terminal may generate a signal to be transmitted by performing processes such as channel coding and modulation.
  • the signal generated in the uplink transmission processing block 2001 is multiplexed with other uplink signals by the multiplexer 2002, processed in the transmission RF block 2003, and then transmitted to the base station.
  • the receiver 2008 of the terminal demultiplexes the signals received from the base station and distributes them to each downlink reception processing block.
  • the downlink reception processing block 2005 may obtain control information or data transmitted by the base station by performing processes such as demodulation and channel decoding on the downlink signal of the base station.
  • the terminal receiver 2008 may support the operation of the control unit 2009 by applying the output result of the downlink reception processing block to the control unit 2009.
  • 21 illustrates an example of a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
  • the terminal of the present disclosure may include a processor 2130, a transceiver 2110, and a memory 2120.
  • the components of the terminal are not limited to the above-described examples.
  • a terminal may include more or fewer components than the aforementioned components.
  • the processor 2130, the transceiver 2110, and the memory 2120 may be implemented as a single chip.
  • the transmission/reception unit 2110 of FIG. 21 may include the transmission unit 2004 and the reception unit 2008 of FIG. 20 .
  • the processor 2130 of FIG. 21 may include the controller 2009 of FIG. 20 .
  • the processor 2130 may control a series of processes in which the terminal may operate according to the above-described embodiment of the present disclosure. For example, according to an embodiment of the present disclosure, components of a terminal may be controlled to select one of an 'access carrier' and a 'data carrier' to perform a transmission/reception method of the terminal.
  • the processor 2130 may be one or plural, and the processor 2130 may perform a transmission/reception operation of a terminal in a wireless communication system to which the above-described operation of the present disclosure is applied by executing a program stored in the memory 2120.
  • the transceiver 2110 may transmit and receive signals to and from the base station.
  • a signal transmitted and received with the base station may include control information and data.
  • the transceiver 2110 may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting the frequency of a received signal.
  • this transceiver 2110 is only one embodiment, and components of the transceiver 2110 are not limited to the RF transmitter and the RF receiver.
  • the transceiver 2110 may receive a signal through a wireless channel, output the signal to the processor 2130, and transmit the signal output from the processor 2130 through a wireless channel.
  • the memory 2120 may store programs and data required for operation of the terminal. In addition, the memory 2120 may store control information or data included in signals transmitted and received by the terminal.
  • the memory 2120 may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. In addition, the number of memories 2120 may be plural. According to an embodiment, the memory 2120 may be configured according to whether a target to be communicated with is an 'access carrier' or a 'data carrier' according to the above-described embodiments of the present disclosure. It is possible to store a program for performing transmission/reception operations of
  • FIG. 22 illustrates an example of a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
  • the base station of the present disclosure may include a processor 2230, a transceiver 2210, and a memory 2220.
  • components of the base station are not limited to the above-described examples.
  • a base station may include more or fewer components than the aforementioned components.
  • the processor 2230, the transceiver 2210, and the memory 2220 may be implemented as a single chip.
  • the processor 2230 may control a series of processes so that the base station operates according to the above-described embodiment of the present disclosure. For example, components of a base station may be controlled to perform a method of scheduling a terminal according to whether an 'access carrier' communicates with a terminal or a 'data carrier' communicates with a terminal according to an embodiment of the present disclosure.
  • the processor 2230 may be one or plural, and the processor 2230 executes a program stored in the memory 2220 to determine whether the 'access carrier' of the present disclosure communicates with the terminal or the 'data carrier' communicates with the terminal.
  • a method of scheduling a UE may be performed according to the
  • the transmitting and receiving unit 2210 may transmit and receive signals to and from the terminal.
  • a signal transmitted and received with the terminal may include control information and data.
  • the transceiver 2210 may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting the frequency of a received signal.
  • this transceiver 2210 is only an example, and components of the transceiver 2210 are not limited to the RF transmitter and the RF receiver.
  • the transceiver 2210 may receive a signal through a wireless channel, output the signal to the processor 2230, and transmit the signal output from the processor 2230 through the wireless channel.
  • the memory 2220 may store programs and data necessary for the operation of the base station. In addition, the memory 2220 may store control information or data included in signals transmitted and received by the base station.
  • the memory 2220 may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the number of memories 2220 may be plural.
  • the memory 2220 is a program for performing a method of scheduling a terminal according to whether an 'access carrier' communicates with the terminal or a 'data carrier' communicates with the terminal, which is the above-described embodiments of the present disclosure. can be saved.
  • a first transmission reception point includes at least one transceiver; and a controller coupled to the at least one transceiver, wherein the controller transmits a first signal including information on one or more TRPs operating in a frequency band different from that of the first TRP to a terminal. and receives, from the terminal, a random access preamble including information on at least one TRP preferred by the terminal determined based on the first signal, wherein the first TRP corresponds to the information on the at least one TRP. based on the second TRP, transmits a signal instructing the second TRP to switch to a switch-on state, and transmits a signal instructing the terminal to perform a random access procedure with the second TRP can be configured to transmit.
  • the controller transmits information on at least one TRP preferred by the terminal included in the random access preamble to an access mobility and management function (AMF) node, and the AMF transmits the at least one
  • the AMF access mobility and management function
  • the controller may be further configured to receive, from the AMF, a signal instructing to manage the terminal with the second TRP.
  • At least one TRP preferred by the terminal may be determined based on a location of the terminal or a preset association relationship.
  • the first signal may include at least one of SSB and CSI-RS.
  • the controller may be further configured to receive, from the second TRP, a response signal indicating reception of a signal instructing transition to the switched-on state.
  • a second transmission reception point may include at least one transceiver; and a controller coupled to the at least one transceiver, wherein the controller receives a signal instructing to change a switch state of the second TRP, and based on the received signal, the switch state is switched, and when the switched switch state is a state in which the transmission and reception functions of the second TRP are activated, a first signal is transmitted to the terminal, and from the terminal, based on the first signal, a random It may be configured to receive an access preamble.
  • the signal instructing to switch the switch state may include a signal received from a first transmission reception point (TRP) operating in a frequency band different from that of the second TRP.
  • TRP transmission reception point
  • the signal instructing to switch the state of the switch may include a signal received from an access mobility and management function (AMF) node.
  • AMF access mobility and management function
  • the switched switch state is a state in which only the reception function of the second TRP is activated, and the controller activates the transmission function of the second TRP based on the random access preamble received from the terminal , and may be further configured to transmit the first signal to the terminal.
  • the first signal may include at least one of SSB and CSI-RS.
  • a method performed by a first transmission reception point provides a user equipment with information about one or more TRPs operating in a frequency band different from that of the first TRP. transmitting a first signal containing information; Receiving, from the terminal, a random access preamble including information on at least one TRP preferred by the terminal determined based on the first signal; When the first TRP determines a second TRP based on the information on the at least one TRP, transmitting a signal instructing the second TRP to switch to a switch-on state; and transmitting a signal instructing the terminal to perform a random access procedure with the second TRP.
  • TRP transmission reception point
  • the method may include transmitting information about at least one TRP preferred by the terminal included in the random access preamble to an access mobility and management function (AMF) node; And when the AMF determines the second TRP based on the information on the at least one TRP, receiving a signal from the AMF instructing to manage the terminal with the second TRP. .
  • AMF access mobility and management function
  • At least one TRP preferred by the terminal may be determined based on a location of the terminal or a preset association relationship.
  • the first signal may include at least one of SSB and CSI-RS.
  • the method may further include receiving, from the second TRP, a response signal indicating reception of a signal instructing switching to the switch-on state.
  • constituent elements included in the present disclosure are expressed in singular or plural numbers according to the specific embodiments presented.
  • the singular or plural expressions are selected appropriately for the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural are composed of the singular number or singular. Even the expressed components may be composed of a plurality.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente divulgation concerne un système de communication 5G ou 6G destiné à prendre en charge un débit de transmission de données supérieur. Selon divers modes de réalisation de la présente divulgation, un procédé exécuté par un premier point d'émission-réception (TRP) dans un système de communication sans fil comprend les étapes consistant à : transmettre à un terminal un premier signal contenant des informations relatives à un ou plusieurs TRP fonctionnant dans une bande de fréquences différente de celle du premier TRP ; recevoir du terminal un préambule d'accès aléatoire contenant des informations relatives à au moins un TRP qui est préféré par le terminal et déterminé sur la base du premier signal ; transmettre un signal ordonnant au second TRP de commuter vers un état d'activation si le premier TRP détermine le second TRP sur la base des informations relatives audit au moins un TRP ; et transmettre un signal ordonnant au terminal d'effectuer une procédure d'accès aléatoire avec le second TRP.
PCT/KR2023/001920 2022-02-09 2023-02-09 Procédé et appareil de commande d'une station de base dans un système de communication sans fil WO2023153835A1 (fr)

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WO2017218762A1 (fr) * 2016-06-15 2017-12-21 Convida Wireless, Llc Procédures d'accès aléatoire dans des réseaux de prochaine génération
WO2020222619A1 (fr) * 2019-05-02 2020-11-05 엘지전자 주식회사 Procédé d'émission ou de réception de signal dans un système de communication sans fil et dispositif de prise en charge associé
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WO2017218762A1 (fr) * 2016-06-15 2017-12-21 Convida Wireless, Llc Procédures d'accès aléatoire dans des réseaux de prochaine génération
US20210167821A1 (en) * 2018-08-17 2021-06-03 Idac Holdings, Inc. Beam management for multi-trp
WO2020222619A1 (fr) * 2019-05-02 2020-11-05 엘지전자 주식회사 Procédé d'émission ou de réception de signal dans un système de communication sans fil et dispositif de prise en charge associé
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